From the website - "This is a summarization strategy called "the incredible shrinking notes" where students start out writing a summary on the large index card. Students are then given the medium sized card and have to condense the information onto the medium sized card. Finally, students are given the small card and condense the information down even further onto the small card."
Multiplication Strategies Foldable - great for interactive math notebooks. Teach students several strategies so they can use the one that works well for them or for the situation.